Images by Genevieve Carbonatto  With M mode , the transition point can be recorded . On the M mode trace, on the right, note the statosphere sign associated with a pneumothorax (absence of lung sliding) and on the left the seashore sign seen with lung sliding

Right lung: Lung sliding – no pneumothorax

Left lung: absent lung sliding – pneumothorax

Transition point: Point at which the normal lung and pneumothorax meet. It moves with respiration





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